SDTurbo-
You might check the tightness of the hose clamps on the high pressure connection points at output of turbo, in and out of intercooler, and inlet to throttle body. SRT4 people with S2 found that they were leaking boost at some of those points. Mine actually popped off at the throttle body one time, and I found that the others weren't very tight. You may be leaking boost there now that the pressure is higher with Stage 1.
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